sidestr-round 0.2.1

The level-2 co-signing round of sidestr sidechains, as a pure state machine that interoperates with the reference signer on the wire: block proposals, partial signatures and sealed blocks (kinds 23510/23511/23514) with the proposer ring and lateness entitlement, the peg-out PSBT round (23512/23513) over rust-bitcoin, a durable vote journal, and a runnable signer. A port of siding's round.mjs and pegoutround.mjs by Melvin Carvalho.